Edit:
We have now a temporary git repository at gitorious:
http://gitorious.org/replicant

== Before starting ==
 * root your phone
 * Backup your current system!!!

== Setup the build system ==
Let's say that our build directory is ~/replicant

Check out the Dream Android repository :
{{{
 mkdir bin
 cd bin
 wget http://android.git.kernel.org/repo
 chmod a+x repo
 cd ..
 mkdir replicant
 cd replicant
 ../bin/repo init -u git://gitorious.org/replicant/manifest.git
 ../bin/repo sync
}}}
== Each time you want to build something ==
 * open a new console
 * Then type:
{{{
 cd ~/replicant
 export ANDROID_JAVA_HOME=$JAVA_HOME
 lunch htc_dream-eng
 make
}}}
 * The files to flash are in ~/replicant/out/target/product/dream,flash them and then clear the cache
 * boot and push the wifi firmware if you want it


== If you want to build a particular project ==

== Status ==
 * ril works more or less:
 * * calls should work(in/out)
 * * sms should work(in/out)
 * * hearphones not supported
 
 * sound works even with headphones(beware calls's sound don't work with headphones)